Messages in this thread | | | From | Sagar Shrikant Kadam <> | Subject | [PATCH v5 0/3] mtd: spi-nor: add support for is25wp256 spi-nor flash | Date | Wed, 12 Jun 2019 16:17:53 +0530 |
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The patch set is tested on HiFive Unleashed A00 board and is based on mainline kernel v5.2-rc1. Its intended to add support for 32 MB spi-nor flash mounted on the board. Memory Device supports 4/32/ and 64 KB sectors size. The device id table is updated accordingly.
Flash parameter table for ISSI device is set to use macronix_quad_enable procedure to set the QE (quad-enable) bit of Status register.
A unilaterlay block unlocking scheme is added in patch 2.
These patches are based on original work done by Wesley Terpstra and/or Palmer Dabbelt: https://github.com/riscv/riscv-linux/commit/c94e267766d62bc9a669611c3d0c8ed5ea26569b
Erase/Read/Write operations are verified on HiFive Unleashed board using mtd and flash utils (v1.5.2): 1. mtd_debug :Options available are : erase/read/write. 2. flashcp :Single utility that erases flash, writes a file to flash and verifies the data back. 3. flash_unlock: Unlock flash memory blocks.Arguments: are offset and number of blocks. 3. flash_lock: Lock flash memory blocks. Arguments: are offset and number of blocks.
Unlock scheme clears the protection bits of all blocks in the Status register.
Lock scheme: A basic implementation based on stm_lock scheme and is validated for different number of blocks passed to flash_lock. ISSI devices have Top/Bottom area selection in "function register" which is OTP memory.
Revision history:
V4<->V5: -Rebased to linux version v5.2-rc1. -Updated heading of this cover letter with sub-system, instead of just plain "add support for is25wp256..."
V3<->V4: -Extracted comman code and renamed few stm functions so that it can be reused for issi lock implementation. -Added function's to read and write FR register, for selecting Top/Bottom area.
V2<->V3: -Rebased patch to mainline v5.1 from earlier v5.1-rc5. -Updated commit messages, and cover letter with reference to git URL and author information. -Deferred flash_lock mechanism and can go as separate patch.
V1<-> V2: -Incorporated changes suggested by reviewers regarding patch/cover letter versioning, references of patch. -Updated cover letter with description for flash operations verified with these changes. -Add support for unlocking is25xxxxxx device. -Add support for locking is25xxxxxx device.
v1: -Add support for is25wp256 device.
Sagar Shrikant Kadam (3): mtd: spi-nor: add support for is25wp256 mtd: spi-nor: add support to unlock flash device mtd: spi-nor: add locking support for is25xxxxx device
drivers/mtd/spi-nor/spi-nor.c | 348 +++++++++++++++++++++++++++++++++++------- include/linux/mtd/spi-nor.h | 7 + 2 files changed, 304 insertions(+), 51 deletions(-)
-- 1.9.1
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